package LuoGu;

import java.util.Scanner;

public class B2029 {
    public static void main(String[] args) {
        Scanner sc=new Scanner(System.in);
        int h=sc.nextInt();
        int r=sc.nextInt();
        double sum=3.14*h*r*r;
        if(20000%sum==0){
            System.out.println((int)Math.ceil(20000/sum));
        }else{
            System.out.println((int)Math.ceil(20000/sum));
        }
    }
}
